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Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,861,976 $ 3,256,289
Securities Available for Sale, Gross Unrealized Gains 184 13,509
Securities Available for Sale, Gross Unrealized (Losses) (217,796) (30,921)
Debt Securities, Available-for-sale 2,644,364 3,238,877
Securities Held to Maturity, Amortized Cost 1,137,754 342,537
Securities Held to Maturity, Gross Unrealized Gains 468 11,011
Securities Held to Maturity, Gross Unrealized (Losses) (35,763) (37)
Securities Held to Maturity, Estimated Fair Value 1,102,459 353,511
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 448,403 349,562
Securities Available for Sale, Gross Unrealized Gains 0 16
Securities Available for Sale, Gross Unrealized (Losses) (28,707) (4,938)
Debt Securities, Available-for-sale 419,696 344,640
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 12,439 14,044
Securities Available for Sale, Gross Unrealized Gains 0 20
Securities Available for Sale, Gross Unrealized (Losses) (492) (337)
Debt Securities, Available-for-sale 11,947 13,727
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 5,102 5,134
Securities Available for Sale, Gross Unrealized Gains 77 580
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Debt Securities, Available-for-sale 5,179 5,714
Securities Held to Maturity, Amortized Cost 5,320 7,328
Securities Held to Maturity, Gross Unrealized Gains 20 64
Securities Held to Maturity, Gross Unrealized (Losses) (2) (3)
Securities Held to Maturity, Estimated Fair Value 5,338 7,389
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 34,534 38,942
Securities Available for Sale, Gross Unrealized Gains 41 665
Securities Available for Sale, Gross Unrealized (Losses) (2,335) (34)
Debt Securities, Available-for-sale 32,240 39,573
Securities Held to Maturity, Amortized Cost 4,624 5,005
Securities Held to Maturity, Gross Unrealized Gains 6 187
Securities Held to Maturity, Gross Unrealized (Losses) (179) (3)
Securities Held to Maturity, Estimated Fair Value 4,451 5,189
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 2,068,850 2,230,498
Securities Available for Sale, Gross Unrealized Gains 8 8,945
Securities Available for Sale, Gross Unrealized (Losses) (180,312) (21,014)
Debt Securities, Available-for-sale 1,888,546 2,218,429
Securities Held to Maturity, Amortized Cost 185,554 43,444
Securities Held to Maturity, Gross Unrealized Gains 0 962
Securities Held to Maturity, Gross Unrealized (Losses) (11,152) 0
Securities Held to Maturity, Estimated Fair Value 174,402 44,406
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 148,843 193,908
Securities Available for Sale, Gross Unrealized Gains 1 2,879
Securities Available for Sale, Gross Unrealized (Losses) (4,686) (97)
Debt Securities, Available-for-sale 144,158 196,690
Securities Held to Maturity, Amortized Cost 210,479 241,934
Securities Held to Maturity, Gross Unrealized Gains 6 9,015
Securities Held to Maturity, Gross Unrealized (Losses) (6,217) (31)
Securities Held to Maturity, Estimated Fair Value 204,268 250,918
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 143,805 424,201
Securities Available for Sale, Gross Unrealized Gains 57 404
Securities Available for Sale, Gross Unrealized (Losses) (1,264) (4,501)
Debt Securities, Available-for-sale 142,598 420,104
Securities Held to Maturity, Amortized Cost 731,777 44,826
Securities Held to Maturity, Gross Unrealized Gains 436 783
Securities Held to Maturity, Gross Unrealized (Losses) (18,213) 0
Securities Held to Maturity, Estimated Fair Value $ 714,000 $ 45,609